Patents by Inventor Denis M. Shaw

Denis M. Shaw has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Power supply for a hot-filament cathode
    Patent number: 6911789
    Abstract: In accordance with one embodiment of the present invention, there is provided a switch-mode power supply to generate the heating current for a hot-filament electron-emitting cathode. The power supply directly couples, without an output transformer, the output from a full-bridge converter that operates at an output frequency in the range from ten Hz to ten kHz. A connection to a reference potential that minimizes the potential fluctuation of the cathode is provided by one of the direct-current inputs to the converter.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: June 28, 2005
    Assignees: Kaufman & Robinson, Inc., Advanced Energy Industries, Inc.
    Inventors: Steven J. Geissler, James R. Kahn, Harold R. Kaufman, Denis M. Shaw
  • Power supply for a hot-filament cathode
    Publication number: 20040183470
    Abstract: In accordance with one embodiment of the present invention, there is provided a switch-mode power supply to generate the heating current for a hot-filament electron-emitting cathode. The power supply directly couples, without an output transformer, the output from a full-bridge converter that operates at an output frequency in the range from ten Hz to ten kHz. A connection to a reference potential that minimizes the potential fluctuation of the cathode is provided by one of the direct-current inputs to the converter.
    Type: Application
    Filed: March 4, 2003
    Publication date: September 23, 2004
    Inventors: Steven J. Geissler, James R. Kahn, Harold R. Kaufman, Denis M. Shaw